unheard–of
1 ENTRIES FOUND:
Britannica Dictionary definition of UNHEARD–OF
:
not known to have existed or happened before
:
very unusual
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In those days, indoor plumbing was almost unheard-of. [=very few people had indoor plumbing]
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He was hired for an unheard-of salary of more than a million dollars.
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It's not unheard-of for a patient's condition to improve this quickly.
